@article{stark_holley_1975,  title={Final report on studies of nutrient cycling on white and black water areas in Amazonia},  volume={5},  ISSN={0044-5967},  url={https://doi.org/10.1590/1809-43921975051051},  DOI={10.1590/1809-43921975051051},  number={1},  journal={Acta Amazonica},  publisher={Instituto Nacional de Pesquisas da Amazônia},  author={Stark, N. and Holley, C.},  year={1975},  month={Apr},  pages={51–76} }